This folder contains a number of scripts which are used as part of the PyTorch build process. This directory also doubles as a Python module hierarchy (thus the __init__.py).

Overview

Modern infrastructure:

• autograd - Code generation for autograd. This includes definitions of all our derivatives.
• jit - Code generation for JIT
• shared - Generic infrastructure that scripts in tools may find useful.
  • module_loader.py - Makes it easier to import arbitrary Python files in a script, without having to add them to the PYTHONPATH first.

Legacy infrastructure (we should kill this):

• nnwrap - Generates the THNN/THCUNN wrappers which make legacy functionality available. (TODO: What exactly does this implement?)
• cwrap - Implementation of legacy code generation for THNN/THCUNN. This is used by nnwrap.

Build system pieces:

• setup_helpers - Helper code for searching for third-party dependencies on the user system.
• build_pytorch_libs.sh - Script that builds all of the constituent libraries of PyTorch, but not the PyTorch Python extension itself. We are working on eliminating this script in favor of a unified cmake build.
• build_pytorch_libs.bat - Same as above, but for Windows.
• build_libtorch.py - Script for building libtorch, a standalone C++ library without Python support. This build script is tested in CI.

Developer tools which you might find useful:

• clang_tidy.py - Script for running clang-tidy on lines of your script which you changed.
• git_add_generated_dirs.sh and git_reset_generated_dirs.sh - Use this to force add generated files to your Git index, so that you can conveniently run diffs on them when working on code-generation. (See also generated_dirs.txt which specifies the list of directories with generated files.)

Important if you want to run on AMD GPU:

• amd_build - HIPify scripts, for transpiling CUDA into AMD HIP. Right now, PyTorch and Caffe2 share logic for how to do this transpilation, but have separate entry-points for transpiling either PyTorch or Caffe2 code.
  • build_amd.py - Top-level entry point for HIPifying our codebase.

Tools which are only situationally useful:

• aten_mirror.sh - Mirroring script responsible for keeping https://github.com/zdevito/ATen up-to-date.
• docker - Dockerfile for running (but not developing) PyTorch, using the official conda binary distribution. Context: https://github.com/pytorch/pytorch/issues/1619
• download_mnist.py - Download the MNIST dataset; this is necessary if you want to run the C++ API tests.
• run-clang-tidy-in-ci.sh - Responsible for checking that C++ code is clang-tidy clean in CI on Travis